HR: 1340h
AN: A53B-0877    [Abstracts]
TI: Greenhouse Forcing Outweighs Decreasing Solar Radiation in Europe - Driving Rapid Temperature Rise Over Land
AU: * Philipona, R
EM: r.philipona@pmodwrc.ch
AF: Observatory Davos and World Radiation Center, Dorfstrasse 33, Davos Dorf, 7260 Switzerland
AU: Duerr, B
EM: b.duerr@pmodwrc.ch
AF: Observatory Davos and World Radiation Center, Dorfstrasse 33, Davos Dorf, 7260 Switzerland
AB: Since 1988, surface temperature over land in Europe increased three times faster than the northern hemisphere average. Here we contrast surface climatic and radiative parameters measured in central Europe over different time periods, including the extreme summer 2003, to pinpoint the role of individual radiative forcings in temperature increases. Interestingly, surface solar radiation rather decreases since 1981. Also, no net radiative cooling or warming is observed under changing cloud amounts. However, high correlation (r$_{T}$ = 0.86) to increasing temperature is found with total heating radiation at the surface, and very high correlation (r$_{T}$ = 0.98) with cloud-free longwave downward radiation. Preponderance of longwave downward radiative forcing suggests rapidly increasing greenhouse warming, which outweighs the decreasing solar radiation measured at the surface and drives rapid temperature increases over land.
DE: 3359 Radiative processes
DE: 4215 Climate and interannual variability (3309)
DE: 1803 Anthropogenic effects
DE: 1600 GLOBAL CHANGE (New category)
DE: 1630 Impact phenomena
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting